Offshore Transportation

Supporting Responsible Resource Management, Energy Infrastructure Decommissioning, and Sustainability

We are a world-class provider of marine services with diversified fleet of support vessels, designed to support the full lifecycle of offshore and coastal energy infrastructure, including construction, maintenance, production enhancement, and decommissioning and reclamation.

Our Fleet

Delivering expertise, quality and value.

Offshore Supply Vessels

Leading provider of offshore supply vessels from 150 feet to over 180 feet, offering safe, reliable and versatile transportation of essential equipment and supplies in support of existing energy production, infrastructure maintenance and asset decommissioning in offshore Gulf of Mexico. Our vessels offer a range of capabilities, including Dynamic Positioning, methanol capabilities, and high volume liquid mud and dry bulk capacities.


Leading provider of modern liftboats with a range of vessels suitable for working both in shallow, coastal waters and in depths of up to 200 feet. Our liftboats are equipped with cranes capable of delivering cost-effective solutions for platform decommissioning and removal of smaller structures. Only vessel provider with affiliates that offer in-house services to perform inspection, maintenance and repair on offshore infrastructure; production enhancement; and asset decommissioning.

Crew Boats

Leading provider of traditional crew boats from 145 feet to over 170 feet, offering speed and versatility in support of existing energy production, infrastructure maintenance and asset decommissioning in offshore Gulf of Mexico. Our fleet offers both a cost-effective, comfortable, safe alternative to helicopter transportation, and cargo capabilities including deck cargo, fuel, potable water and production fluids.

Affiliated Services

We are committed to providing safe, reliable expertise to do the job right the first time. We are the only single-source provider of marine transportation, well intervention, commercial diving and decommissioning and reclamation services, offering in-house engineering, project management and execution for every stage of the decommissioning value chain. Multiple services, one safety culture, one team.

Join the

Alliance Team

We are currently accepting applications for 500T Captains, 200T Captains, 100T Captains, Mates, License Chief Engineers, DDE 4000, QMEDs, Certified Crane Operators, Able Bodied Seaman, Ordinary Seaman, Unlicensed Engineers, and Deckhands.

Quality Health Safety & Environment

The safety, health and welfare of employees, contractors, clients and the public is a leading priority and core value, underpinning our commitment to responsible management of all phases of operations. Our legacy of safety and environmental stewardship is governed by our Safety and Environmental Management System (SEMS), ensuring that we minimize environmental impact, particularly given our focus on decommissioning and reclamation services designed to preserve and restore our coastlines and oceans for future generations.

Alliance Offshore

Alliance Offshore, a member of the Alliance Energy Group, is an established offshore transportation company providing crew boats, liftboats and offshore supply vessels to major and independent energy producers, particularly in coastal and offshore environments. Our services are geared to supporting our clients in connection with i) responsible resource management – enhancing, maintaining and extending existing production and ii) permanently abandoning and removing, salvaging and recycling end-of-life energy infrastructure.

Alliance and its affiliates have been operating a wide variety of marine assets in the Gulf of Mexico for decades. Management has significant transportation experience, delivering world-class logistics services with a strong track record of reliability, safety, compliance and integrity.